William Cook, director of the Washington County Public Services gives an overview of the rock slide that has closed a portion of Route 4 in Fort Ann, N.Y. October 15, 2012. (Skip Dickstein/Times Union)

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Numerous pieces of heavy excavation equipment have been brought to the scene to determine if there were any vehicles caught under the rocks. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Excavation equipment was brought to the clear the roadway. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Excavation equipment was brought to the clear the roadway. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...

A large rock slide Monday morning has closed State Route 4 north of Fort Ann. Excavation equipment was brought to the clear the roadway. (Skip Dickstein / Times Union)

A large rock slide Monday morning has closed State Route 4 north of...